. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 22 Bulletin Museum of Comparative Zoology, Vol. 146, No. 1 amiid. The Late Mesozoic European forms of Urocles and Amiopsis have a much ab- breviated dorsal fin that terminates more anteriorly than does that of the species of Amia. For Amiopsis dolloi, an Early Creta- ceous (Wealden) amiid from Bernissart, Belgium, Traquair (1911) figured 17 dorsal fin supports, while Lange (1968) estab- lishes a specific range of 17-25 for the Eu- European Upper Jurassic Urocles. The basis of Shufeldt's (1885: ) model for a prim
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 22 Bulletin Museum of Comparative Zoology, Vol. 146, No. 1 amiid. The Late Mesozoic European forms of Urocles and Amiopsis have a much ab- breviated dorsal fin that terminates more anteriorly than does that of the species of Amia. For Amiopsis dolloi, an Early Creta- ceous (Wealden) amiid from Bernissart, Belgium, Traquair (1911) figured 17 dorsal fin supports, while Lange (1968) estab- lishes a specific range of 17-25 for the Eu- European Upper Jurassic Urocles. The basis of Shufeldt's (1885: ) model for a primitive amiid with a continuous dorsal- caudal fin was the presence in Recent Amia calva specimens of what Shufeldt called a "series of delicate little bones that continue the interspinous bones of the dorsal fin as far as the caudal ; These five bones he considered to be the continuation of the dorsal interneural spines; Hay (1895), in his discussion of Amia calva, refers to them as "epural interspinous ; These small bones can also be seen in several of the fossil amiids I have studied, especially A. scutata (YPM 6241), A. fragosa (UA 5425), and A. uintaensis (AMNH 785) (Fig. 8). From these fossil forms, however, it is dif- cult to determine whether the origin of these bones is from the dorsal or caudal neural spines. An examination of the caudal fin of Urocles lepidotus (Fig. 6; also Nybelin, 1963: 506, fig. 17), which is known to have an abbreviated, more an- teriorly located dorsal fin, shows that these epural bones are associated with the caudal. fin, which supports the upper caudal lepi- dotrichia in much the same manner as the hypurals in the ventral tail region. A further indication that these epural inter- spinous bones are not vestigial dorsal spine supports is found in Traquair's (1911) plate 7 of Amiopsis dolloi and his plate 8 of Amiopsis lata (both species from the Creta- ceous [Wealden] of Belgium); these plates show the bones to be cl
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